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Message-Id: <20191229162419.014024111@linuxfoundation.org>
Date: Sun, 29 Dec 2019 18:18:33 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
Mattijs Korpershoek <mkorpershoek@...libre.com>,
Marcel Holtmann <marcel@...tmann.org>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 065/161] Bluetooth: hci_core: fix init for HCI_USER_CHANNEL
From: Mattijs Korpershoek <mkorpershoek@...libre.com>
[ Upstream commit eb8c101e28496888a0dcfe16ab86a1bee369e820 ]
During the setup() stage, HCI device drivers expect the chip to
acknowledge its setup() completion via vendor specific frames.
If userspace opens() such HCI device in HCI_USER_CHANNEL [1] mode,
the vendor specific frames are never tranmitted to the driver, as
they are filtered in hci_rx_work().
Allow HCI devices which operate in HCI_USER_CHANNEL mode to receive
frames if the HCI device is is HCI_INIT state.
[1] https://www.spinics.net/lists/linux-bluetooth/msg37345.html
Fixes: 23500189d7e0 ("Bluetooth: Introduce new HCI socket channel for user operation")
Signed-off-by: Mattijs Korpershoek <mkorpershoek@...libre.com>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
net/bluetooth/hci_core.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index d6d7364838f4..ff80a9d41ce1 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -4215,7 +4215,14 @@ static void hci_rx_work(struct work_struct *work)
hci_send_to_sock(hdev, skb);
}
- if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
+ /* If the device has been opened in HCI_USER_CHANNEL,
+ * the userspace has exclusive access to device.
+ * When device is HCI_INIT, we still need to process
+ * the data packets to the driver in order
+ * to complete its setup().
+ */
+ if (hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
+ !test_bit(HCI_INIT, &hdev->flags)) {
kfree_skb(skb);
continue;
}
--
2.20.1
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